Electric contact plug



May 26, 193 HIL 2,042,398

ELECTRIC CONTACT PLUG Filed April 19, 1955 I a \V Patented May 26, 1936 UNITED. STATES PATENT FFlQE ELECTRIC CONTACT PLUG Application April 19, 1935, Serial No. 17,343

2 Claims.

This invention relates to certain new and useful improvements in electric contact plugs.

The primary object of the invention is to provide an electric contact plug of the type employed in connection with electric sad irons, toasters, heaters and the like for attachment to terminals for the conduction of electricity.

In attachment plugs of the foregoing character, two contacts are usually employed and are of the spring type for engagement with two terminals and the interior of the plug casing becomes highly heated and hastens disintegration of the casing body and wear on the contacts. It is therefore an important object of this invention to provide for a thorough ventilation of the plug by disposing the conductor wires in spaced relation at their points of entry into the plug casing and to utilize the usual resilient plug pulling device as an air ventilating passage for the circulation of air into and through the plug casing, and

for anchoring the conductor wires.

A still further object of the invention is to provide a contact plug of the foregoing character wherein the electric wires that are attached to the contacts are spaced from each other within the plug casing and pass outwardly of the casing at spaced points respectively opposite the longitudinal axis of thecasing so that liability of the wires touching each other within the casing is eliminated.

With the above and other objects in View that will become apparent as the nature of the invention is better understood, the same consists in the novel form, combination and arrangement of parts hereinafter more fully described, and then claimed.

In the drawing:-

Figure 1 is a side elevational view of an electric contact plug constructed in accordance with the present invention, showing the conductor wires separated at their points of passage from the plug casing;

Figure 2 is a plan view of the plug with one casing section removed and showing the spaced relation of the spaced conductor wires within the casing and the unobstructed air passage from the casing through the resilient plug pulling device;

50 Figure 3 is a side edge elevational view of the Figure 4 is an outer end elevational view of the resilient plug pulling device;

Figure 5 is a detail sectional view taken on line 55 5 5 of Figure 3;

Figure 6 is a detail sectional view taken on line 5-6 of Figure 3; and

Figure 7 is a plan View of one of the casing sections with the contacts removed and showin the lateral passages for the conductor wires.

Referring more in detail to the accompanying drawing, there is illustrated an electric contact plug of the conventional exterior configuration and comprising sections lb of identical construction mating to form the casing and secured to- 10 gether by the usual transversely extending counter-sunk nut and bolt combinations ll.

Each casing section I0 as shown in Figure 7 has a raised central longitudinally extending rib l2 providing lateral grooves l3 for the reception 15 of the usual contacts I4 and each groove l3 has cross ribs l5 rising from the bottom walls there-v of to space the contacts I4 from the walls of the casing ID. The ribs l2 have openings I6 therein through which the bolts l I pass. 20

The inner end of each casing section I0 is provided with a semi-circular channel I! with the two channel sectionsmating to form a circular channel for the reception of one end of the resilient plug puller. The semi-circular chan- 25 nels 11 are spaced from opposite side edges of the casing section II] and the inner end wall of the casing section between each end of the semicircular channel IT and the side edge of the casing section is cut away as at Hi to provide a 30 passage for the conductor cord. A diagonally extending rib [2a is disposed adjacent each cutaway portion and the inner end of the rib terminates in spaced relation to the longitudinal rib l2 to provide an air passage or vent I2b. 35

As shown in Figure 2, the contacts M are seated in the. respective grooves I 3 and the conductor cords l9 are anchored as at 20 to the respective contacts I 4, the conductors respectively passing through the cut away portions l8 and being en- 40 tirely separated from each other within the plug casing and at their points of passage from the casing and exteriorly thereof.

The resilient plug pulling device comprises a tubular coil spring 21 having a ring 22 at one end thereof removably received in the channel sections I! to be locked in said sections when the casing sections are secured together. The other end of the tubular spring 2! is anchored in the pull handle 23 as shown in Figure 6 and said pull handle is provided with a cross head 24 outwardly of the tubular portion 25 to which the spring is anchored. The cross head 24 of the pull handle is of channel formation as shown in Figures 4 and 6 and the tubular portion 25 thereof opens into the cross head to provide an unobstructedair passage from the interior of the plug casing to the tubular coilspring'2l and pull han- 1 dle. A transverse opening 26 is formedin'the source of electrical energy.

. From the above detailed description of the in vention it is believed that the construction and use thereof will at oncebe apparent, it being noted" that the' conductor wires are completely 7 separated from each other within the plug casing, thereby eliminating the blowing of fuses and the burning of wires while a thorough ventilation of the plug is possible by directing the conductor wires from the plug casing exteriorly of the tubu- ,lar' resilient plug puller so that air may freely circulate through the plug puller into the plug casing. It is also to be understood that the resilient plug puller that is directlyattached to the plug body relieves all strain on the conductor wires and liability of the wires being pulled loose from the contacts is eliminated. 7

'While there is herein shown and described the preferred embodiment of the invention, it is nevertheless to be understood that minor changes may be made therein without departing from the spirit and scope of the invention as claimed.

I claim 7 1. In an electric contact plug of the character 7 described, a plug body formed of sections having spacer ribs and ventilator openings therein, a a

pair of contacts therein, a tubular plug puller ate tached toone end thereof and including a coil spring having one end anchored to the body and,

a transversely extending puller head at itsxouter r open communication with the plug body to' eff ect ventilation of the latter and'conductor wires P attached to the contacts and passing from the plug body in spaced relation to each other and at opposite sides of the plug puller and freely passing in juxta-posed relation through the transverse opening in the outer end of the puller head.

2. In an electric contact plug of the character described, a plug body, a pair of contacts therein, a tubular resilient plug puller attached to'the plug body, conductor wires attached to the contacts, spaced from each other within the plug body and passing from the plug body respectively at opposite sides of the plug puller and the outer end of the plug puller having an opening there- 25 puller whereby strain on the wires is relieved 7 during the pulling of the plug. 7 r

CHARLES L HILE. 

